Synergistic efficacy of ultrasound and ammonium persulfate in inactivating Escherichia coli O157:H7 in buffered peptone water and orange juice.

This study investigated the synergistic effects of ammonium persulfate (PS) and ultrasound (US) on the inactivation of Escherichia coli O157:H7 in buffered peptone water (BPW) and orange juice products. A comprehensive assessment of PS concentrations ranging from 1 to 300 mM, considering not only the statistical significance but also the reliability and stability of the experimental outcomes, showed that 150 mM was the optimal PS concentration for the inactivation of E. coli O157:H7. Additionally, US output intensities varying from 30 % to 60 % of the maximum US intensity were evaluated, and 50 % US amplitude was found to be the optimal US condition. A 50 % amplitude setting on the sonicator corresponds to half of its maximum displacement, approximately 60 µm, based on a maximum amplitude of 120 µm. The inactivation level of E. coli O157:H7 was significantly enhanced by the combined treatment of PS and US, compared to each treatment of PS and US alone. In the BPW, a 10-min treatment with the combination of PS and US resulted in a significant synergistic inactivation, achieving up to a log reduction of 3.86 log CFU/mL. Similarly, in orange juice products, a 5-min treatment with the combination of PS and US yielded a significant synergistic inactivation, with a reduction reaching 5.90 log CFU/mL. Although the treatment caused a significant color change in the sample, the visual differences between the treated and non-treated groups were not pronounced. Furthermore, the combined treatment in orange juice demonstrated significantly enhanced antimicrobial efficacy relative to BPW. Despite identical 5-min treatment periods, the application in orange juice resulted in a substantially higher log reduction of E. coli O157:H7, achieving 7.16 log CFU/mL at a reduced PS concentration of 30 mM, whereas the same treatment in BPW yielded only a 2.89 log CFU/mL reduction at a PS concentration of 150 mM, thereby highlighting its significantly superior antimicrobial performance in orange juice. The mechanism underlying microbial inactivation, induced by the combined treatment of PS and US, was identified as significant cell membrane damage. This damage is mediated by sulfate radicals, generated through the sono-activation of persulfate. In addition, the low pH of orange juice, measured at 3.7, is likely to have further deteriorated the E. coli O157:H7 cells compared to BPW (pH 7.2), by disrupting their cell membranes, proton gradients, and energy metabolism. These findings underscore the effectiveness of PS and US integration as a promising approach for non-thermal pasteurization in the food industry. Further research is needed to optimize treatment parameters and fully explore the practical application of this technique in large-scale food processing operations. Sensory evaluation and nutritional assessment are also necessary to address the limitations of PS.

Systematic Review of Extended Reality Digital Therapy for Enhancing Mental Health Among South Korean Adolescents and Young Adults.

Digital therapy using extended reality (XR) holds great promise for addressing the mental health needs of adolescents and young adults. This study addresses a notable research gap in South Korea by systematically reviewing XR-based digital therapy for the mental health of South Korean adolescents and young adults. We analyzed 26 studies encompassing various aspects, including study type, publication date, research field, research methodology, data sources, program types, program content, sample characteristics, target population, assessment tools, and program effectiveness. Notably, 46.15% of the studies employed an experimental design, whereas over 53% utilized non-experimental approaches. Experimental studies lacked a genuine design, standardized questionnaires, and control variables. Similarly, non-experimental studies failed to report specific literature selection criteria. Consequently, future studies should adopt rigorous methodologies to enhance reliability and validity. Moreover, over 85% of the 26 studies focused solely on virtual reality and did not incorporate augmented or mixed reality. This study identifies the limitations of the previous research. These findings emphasize the need for structured investigations to advance the development of XR-based digital therapy to promote mental health in adolescents and young adults in South Korea.

Factors associated with Korean adolescent's e-cigarette use by the severity level of generalized anxiety disorder (GAD-7).

BACKGROUND: The use of e-cigarette among Korean adolescents is spreading with alarming rapidity, but it has not been studied along with the severity level of GAD-7. This study aims to identify adolescents' e-cigarette use and its associated factors among four different anxiety groups using the problem behavioral theory (PBT). METHODS: A cross-sectional secondary dataset was retrieved from the 2020 Korea Youth Risk Behavior Survey. Of the total sample of 54,948, four anxiety groups were formed: minimal (score 0-4; n = 36,711), mild (score 5-9; n = 12,138), moderate (score 10-14; n = 4143), and severe (score above 15; n = 1965). A total of 11 variables were selected based on the PBT domains. Descriptive analysis, Chi-square, ANOVA, univariate analysis, and multiple linear regression analysis were performed. RESULTS: E-cigarette use was the highest in the order of severe, mild, moderate, and minimal. While cigarette use was associated with vaping in all anxiety groups, adolescents with minimal or mild anxiety levels were more likely to be influenced by tobacco accessibility and other behavior system factors such as sexual intercourse, alcohol use, and smartphone addiction. Meanwhile, secondhand smoke exposure in public areas was only associated with those with severe anxiety levels, and secondhand smoke exposure at school was a significant factor in all anxiety groups except for those with moderate anxiety levels. LIMITATION: Due to the nature of cross-sectional dataset, the study could not draw causal links between vaping and other identified factors, include all the necessary PBT components. CONCLUSION: These findings underscore the need to consider different levels of anxiety when addressing the problems related to vaping among Korean adolescents.

Identification of the Position of a Tethered Delivery Catheter to Retrieve an Untethered Magnetic Robot in a Vascular Environment.

In this paper, we propose a method of identifying the position of a tethered delivery catheter in a vascular environment, recombining an untethered magnetic robot (UMR) to the tethered delivery catheter, and safely retrieving them from the vascular environment in an endovascular intervention by utilizing a separable and recombinable magnetic robot (SRMR) and a magnetic navigation system (MNS). From images of a blood vessel and a tethered delivery catheter taken from two different angles, we developed a method of extracting the position of the delivery catheter in the blood vessel by introducing dimensionless cross-sectional coordinates. Then, we propose a retrieval method for the UMR by using the magnetic force considering the delivery catheter's position, suction force, and rotating magnetic field. We used thane MNS and feeding robot to simultaneously apply magnetic force and suction force to the UMR. In this process, we determined a current solution for generating magnetic force by using a linear optimization method. Finally, we conducted in vitro and in vivo experiments to verify the proposed method. In the in vitro experiment, which was in a glass tube environment, by using an RGB camera, we confirmed that the location of the delivery catheter in the glass tube could be recognized within an average error of 0.05 mm in each of the X- and Z-coordinates and that the retrieval success rate was greatly improved in comparison with that in the case without the use of magnetic force. In an in vivo experiment, we successfully retrieved the UMR in the femoral arteries of pigs.

The child abuse reporting guideline compliance in Korean newspapers.

The rate of child abuse has sharply increased worldwide, especially during the COVID-19 pandemic. As the media's role in addressing child abuse cases is crucial, several international and formal organizations have established child abuse reporting guidelines. This study investigated how closely journalists follow reporting guidelines in addressing child abuse cases. Five major Korean presses and 189 articles from January 1, 2018, to January 31, 2021, were selected using the keyword "child abuse." Each article was analyzed using a guideline framework consisting of 13 items regarding the five principles of the Korean Ministry of Health and Welfare and Central Child Protection Agency reporting guidelines. This study identified a radical growth in media reporting on child abuse cases in South Korea; almost 60% of the articles analyzed came from 2020 and 2021. More than 80% of the articles analyzed did not provide abuse resources, and 70% did not provide factual information. 57.1% of the articles instigated negative stereotypes, and about 30% explicitly mentioned certain family types in the headlines. Nearly 20% of the articles provided excessive details about the method used. Approximately 16% exposed victims' identities. Some articles (7.9%) also described victims as sharing responsibility for the abuse. This study indicates that the media reports of child abuse in South Korea did not follow the guidelines in many facets. The present study discusses the limitations of the current guidelines and suggests future directions for the news media in reporting on child abuse cases nationwide.

Impact of COVID-19 on Adolescents' Smartphone Addiction in South Korea.

The outbreak of COVID-19 impacted numerous people globally, but most notably affected adolescents negatively by contributing to the increase in their use of media and smartphones and therefore their susceptibility to smartphone addiction. Based on the social-ecological model, this study seeks to identify the individual-, family-, and school-level factors of smartphone addiction through two groups of users: a first group whose smartphone usage time increased after the outbreak of COVID-19, and a second group whose usage time did not. Based on the data collected from 360 Korean adolescents aged 15 to 18, results reveal that personal-level factors (i.e., gender, depressive symptoms, self-control, and cyberbullying victimization) are associated with smartphone addiction. For the group whose smartphone usage time increased after the outbreak, economic status, academic performance, and academic year were related to smartphone addiction. Based on these findings, the study makes specific guidelines and suggestions on addressing the smartphone addiction among Korean adolescents.

An International Systematic Review of Prevalence, Risk, and Protective Factors Associated with Young People's E-Cigarette Use.

While the prevalence of young people's conventional cigarette use has decreased in many countries, the use of e-cigarettes has risen. To effectively counteract the growing popularity of e-cigarettes among young people internationally, researchers should know the exact prevalence as well as the protective and risk factors associated with vaping. Based on five eligibility criteria, 53 articles were chosen and analyzed by general characteristics, prevalence, sample characteristics, gender difference, protective factors, and risk factors. In this study, the international pooled prevalence of young people's lifetime e-cigarette use was 15.3%, the current use was 7.7%, and dual use was 4.0%. While the highest lifetime, current, and dual prevalence were found in Sweden, Canada, and the United Kingdom, respectively, the lowest prevalence was found in Germany, followed by South Korea and Sweden. Some protective and risk factors include perceived cost and danger of vaping, parental monitoring, internal developmental assets, cigarette use, family and peer smoking, exposure to online advertisements, and the presence of nearby retail stores. Based on this review, researchers and practitioners can develop different intervention programs and strategies for young smokers.

A Social-Ecological Approach to Understanding the Relationship between Cyberbullying Victimization and Suicidal Ideation in South Korean Adolescents: The Moderating Effect of School Connectedness.

BACKGROUND: Cyberbullying victimization and suicidal ideation are both ongoing deleterious social problems in South Korea. Using the social-ecological approach, this study examined the association between cyberbullying victimization and suicidal ideation as well as the buffering role of school connectedness in this relationship. METHODS: A nationally representative sample of 7333 adolescents from the 2016 Korean Children and Youth Right Study participated in the study. Data were analyzed using descriptive statistics, Wald chi-square test, bivariate correlations, and multivariate logistic regression analyses. RESULTS: Nearly 17.7% of adolescents were cyberbullied, and 28.4% had suicidal ideation in the past 12 months. Cyberbullying victims were at an increased risk of suicidal ideation. The results also found that parental abuse, family dysfunction, and perceived peer relationship stress were positively associated with suicidal ideation, while parental support for autonomy was negatively associated with suicidal ideation. Further, school connectedness moderated on the relationship between cyberbullying victimization and adolescent suicidal ideation. CONCLUSIONS: These findings suggest that various stakeholders should consider interventions and preventive programs that address school connectedness when working with adolescents who are victims of cyberbullying and exhibit suicidal behavior.

Fidelity assessment of the suicide reporting guidelines in Korean newspapers.

BACKGROUND: With the dishonor of being the highest suicide rated country in Organisation for Economic Co-operation and Development, South Korea should take more initiatives in suicide prevention. Although the role of the media and its relation to actual suicide attempts has been tested and supported by many studies, the suicide reporting guidelines are not well followed. The purpose of this study is to examine how well Korean newspapers adhere to existing guidelines and to suggest limitation and improvements for the current guidelines. METHODS: Five mainstream newspapers in South Korea, namely, Kyunghyang Shinmun, Hankyoreh, Chosun Ilbo, JoongAng Daily, and Dong-A Ilbo, were chosen for the analysis. Using the Naver news search engine, articles dated from January 1, 2014, to December 31, 2017, were selected with the keyword "suicide" and advanced option "printed newspaper." However, articles, columns, opinions, and reviews that utilized the word "suicide" in a general context were excluded from the final analysis. Finally, the number of cases was narrowed down to 368. Each article was analyzed using the guideline framework consisting of 13 items: sensational coverage, overstatement, direct wording, method used, details about site/location, photographs, suicide note, generalization, speculation, romanticization, interviews with the bereaved, help-seeking information, and public education. RESULTS: More than 60% of the articles included direct wording (63.9%), mentioned the method used (68.2%), and provided details about the site or location (74.5%). Nearly half of the articles revealed the contents of the suicide note (44.6%). Less than 3% of the suicide reports had information about hotline logo or phone numbers (1.4%) and facts regarding suicide and suicide prevention (2.2%). CONCLUSIONS: Our study revealed that the guidelines were ineffective in their monitoring role and that most of the newspapers were incompliant with many significant guideline items in South Korea. Our findings not only explore the limitations of the current guidelines but also provide an important rationale as to why there should be stronger suicide monitoring regulation or an agency with sufficient authority to prevent suicide in a nation-wide scale.